This luxurious hotel in Switzerland offers a comfy double bed, breakfast, a drink on arrival and a mesmerizing view of the Alps for only $306 per night. What's the catch, you ask? It has no walls and no roof.

The Null Stern hotel, literally meaning "zero stars" in Swiss, isn't an advertising campaign but rather a conceptual art project. Created by brothers Frank and Patrik Riklin, it has redefined the traditional concept of hotel prestige.

Co-founder Daniel Charbonnier explains that the goal was "to put the guest at the center of the experience and to focus on the intangible by reducing everything else to the minimum."